84
COMMISSIONING AND MAINTENANCE
3.11
Troubleshooting
FAULT
CAUSE
SOLUTION
There is a smell of gas
Gas supply circuit
− Check the seal of the gaskets and the
closure of the pressure tapping points
Odour of unburnt gas
Flue gas circuit
− Check the gasket seals
− Make sure there are no obstructions
− Check the combustion quality
Irregular combustion
Burner gas pressure
− Check the setting
Diaphragm installed
− Check the diameter
Clean the burner and exchanger
− Check the conditions
Exchanger passages obstructed
− Check passage cleaning
Faulty fan
− Check operation
Ignition delays with pulsations to the
burner
Burner gas pressure
− Check the setting
Ignition electrode
− Check the positioning and conditions
The modular system becomes dirty very
quickly
Combustion
− Check the combustion controls
The burner does not start upon consent
of the modular system control
Gas valve
− Check for the presence of 230Vac volt-
age on the gas valve terminals, check
wiring and connections
The modular system does not start
No electric power supply (no message on
the display)
− Check the electric connections
− Check the condition of the fuse
The modular system does not arrive at
temperature
Boiler dirty
− Clean the combustion chamber
Burner capacity insufficient
− Check and adjust the burner
Modular system adjustment
− Check correct functioning
− Check the temperature setting
The generator triggers a thermal safety
block
No water
− Check correct functioning
− Check the temperature setting
− Check the electrical wiring
− Check the position of the sensor bulbs
Modular system adjustment
− Check the bleed valve
− Check the heating circuit pressure
The generator is at temperature but the
heating system is cold
Presence of air in the system
− Bleed the system
Pump malfunctioning
− Check/unseize the pump
− Replace the circulator
− Check the electrical connection of the
circulator
The circulator does not start
Pump malfunctioning
− Check/unseize the pump
− Replace the circulator
− Check the electrical connection of the
circulator
Frequent tripping of the system safety
valve
System safety valve
− Check calibration or efficiency
Frequent tripping of the system safety
valve
Incorrect circuit pressure
− Check the circuit pressure
− Check pressure reducer functioning
Frequent tripping of the system safety
valve
CH expansion vessel
− Check the efficiency of the expansion
vessel
